@sj Just a theory... Like most ISPs, ATT provides routers with Wi-Fi. But it allows guest access to other ATT customers. In order to verify you're a legitimate ATT customer, you authenticate with your SIM data.
It seems everyone has a way to share their Wi-Fi now. Authenticating with a SIM makes some sense.
At least that's my theory.
@ericphelps I agree, but what protocols they use, how the information is stored on the SIM, what other SIM capabilities have we not heard of, where's this documented, can I set up my own and how...
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